//题目：输入一行字符，分别统计出其中英文字母、空格、数字和其它字符的个数
#include<stdio.h>
main()
{
    char c;
    int letters=0,space=0,digit=0,others=0;
    printf("Please input some characters\n");
    while((c=getchar())!='\n')
    {
        if(c>='a'&&c<='z'||c>='A'&&c<='Z')
        letters++;
        else if(c==' ')
        space++;
        else if(c>='0'&&c<='9')
        digit++;
        else 
        others++;
    }
    printf("all in all:char=%d space=%d digit=%d others=%d\n",letters,space,digit,others);


}